Support no harsh comments

My husband who I have married one year ago but I’ve known him since 2015 and we do love each other, previously I have two kids from a previous marriage my daughter is aged nine and my son is aged five now he is ready for a baby he hasn’t had any babies this will be his first and he wants to have one but the problem is I don’t know if I want a baby and at the same time I think about babies most of the time. then I don’t because I’m anxious and like I’m thinking will it be hard having three kids has anyone had three kids similar age as mine and how was it? I don’t know why am so anxious I have had two before! And I think my second who is a boy aged 5 is still my little baby and if I have a Thor one it will take his. Place😞 and he still don’t really put his own clothes on properly etc thanks.. plus my mom is no support at all... I can’t share my feelings and can’t tell her if I need help cos she just gives her opinions argues and isn’t understanding she says don’t have one yet don’t be stupid u have 2! But when I was married to my ex she never said don’t have kids! Cos her sister and her and my nana chose my ex for me as they know his family